AUTOIONIZATION SPECTRA OF GASES OBSERVED IN THE VACUUM ULTRAVIOLET.
Physical sciences research papers,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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This report first gives a brief introduction and survey of the previous work on discrete structure in the ionization continua of atomic gases observed by absorption spectroscopy at photon energies less than about 20 ev 600 A. The discrete structure observed is generally due to autoionization. The spectra of metal vapors such as the alkali and alkaline earths, and of the rare gases, argon, krypton, and xenon will be discussed. After this introduction, recent measurements in this laboratory of the absorption coefficients cross sections of the rare gases argon, krypton, and xenon will be discussed. Measurements were obtained down to 600 A with a photoelectric scanning technique using a helium continuum background at a bandwidth of 0.5 A. This bandwidth was sufficient to resolve the earlier members of the intense, diffuse, asymmetrical absorption line series originally found by Beutler between the 2P32 ground state and the 2P12 excited state of the ion. These measurements will be discussed and compared with other recent theoretical and experimental investigations. Finally, a compilation of references to papers on autoionization spectra arranged according to element and complete up to January 1964 is included. Author